161062555601 has 4 divisors (see below), whose sum is σ = 162143512500. Its totient is φ = 159981598704.

The previous prime is 161062555559. The next prime is 161062555637. The reversal of 161062555601 is 106555260161.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 55046544400 + 106016011201 = 234620^2 + 325601^2 .

It is a cyclic number.

It is not a de Polignac number, because 161062555601 - 2¹⁰ = 161062554577 is a prime.

It is a super-2 number, since 2×161062555601² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161062555651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 540478226 + ... + 540478523.

It is an arithmetic number, because the mean of its divisors is an integer number (40535878125).

Almost surely, 2^161062555601 is an apocalyptic number.

It is an amenable number.

161062555601 is a deficient number, since it is larger than the sum of its proper divisors (1080956899).

161062555601 is a wasteful number, since it uses less digits than its factorization.

161062555601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1080956898.

The product of its (nonzero) digits is 54000, while the sum is 38.

The spelling of 161062555601 in words is "one hundred sixty-one billion, sixty-two million, five hundred fifty-five thousand, six hundred one".